I'm Sec C And I Know It - Funny Sexy Math Humor T-Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat 1 Plus Tan C. Can you make magic with numbers? Are you a mathematics genius and want to show it? Perfect for numbers people, hilarious math humor shirt gift for math teachers back to school, students, nerds, geeks, accountants, actuaries, professors Lightweight, Classic fit, Double-needle sleeve and bottom hem